Argon-40/argon-39 age of the El'gygytgyn impact event, Chukotka, Russia

Details Argon-40/argon-39 age of the El'gygytgyn impact event, Chukotka, Russia Argon-40/argon-39 age of the El'gygytgyn impact event, Chukotka, Russia

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000m%26ps...35..591l&link_type=abstract

Meteoritics & Planetary Science, vol. 35, no. 3, pp. 591-600 (2000).

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34

Scientific paper

Lake El'gygytgyn, Chukotka Russia, lies in a ~18 km crater of presumably impact origin. The crater is sited in Cretaceous volcanic rocks of the Okhotsk Chukotka volcanic belt. Laser 40Ar/39Ar dating of impact-melted volcanic rocks from the rim of Lake El'gygytgyn yields a 10 sample weighted plateau age of 3.58 +/- 0.04 Ma. The argon step-heating method was critical in this study in identifying inherited argon in the samples due to incomplete degassing of the Cretaceous volcanic rocks during impact melting. This age is consistent with, but more precise than, previous K-Ar and fission track ages and indicates an "instantaneous" formation of the crater. This tight age control, in conjunction with the presence of impactites, shocked quartz and other features, is consistent with an impact origin for the structure and seems to discount internal (volcanogenic) origin models.

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